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subscription/membership/fee required Ingenta plc https://www.ingentaconnect.com/openurl?genre=article&issn=0003-2999&volume=125&issue=6&spage=1883&aulast=Chang
Heart Surgery free resource MedlinePlus Health Information https://medlineplus.gov/heartsurgery.html
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free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/29190218/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/29190218
free resource scite Smart Citations https://scite.ai/reports/29190218
subscription/membership/fee required Wolters Kluwer https://doi.org/10.1213/ANE.0000000000002217